RESISTANCE TO CHANGE AND FREQUENCY OF RESPONSE‐DEPENDENT STIMULI UNCORRELATED WITH REINFORCEMENT

Stimuli uncorrelated with reinforcement have been shown to enhance response rates and resistance to disruption; however, the effects of different rates of stimulus presentations have not been assessed. In two experiments, we assessed the effects of adding different rates of response‐dependent brief stimuli uncorrelated with primary reinforcement on relative response rates and resistance to change. In both experiments, pigeons responded on variable‐interval 60‐s schedules of food reinforcement in two components of a multiple schedule, and brief response‐dependent keylight‐color changes were added to one or both components. Although relative response rates were not systematically affected in either experiment, relative resistance to presession feeding and extinction were. In Experiment 1, adding stimuli on a variable‐interval schedule to one component of a multiple schedule either at a low rate (1 per min) for one group or at a high rate (4 per min) for another group similarly increased resistance to disruption in the components with added stimuli. When high and low rates of stimuli were presented across components (i.e., within subjects) in Experiment 2, however, relative resistance to disruption was greater in the component presenting stimuli at a lower rate. These results suggest that stimuli uncorrelated with food reinforcement do not strengthen responding in the same way as primary reinforcers.     

Racial reckoning,resistance, and the revolution: A call to community psychology to move forward

This article introduces a special issue of the American Journal of Community Psychology that features racial reckoning, resistance and the revolution in the context of a syndemic, the historical subjugation of communities of Color (COC) to racial hierarchies and the coronavirus (COVID-19). More specifically, this special issue underscores the need for community psychology and other allied disciplines to address this syndemic facing COC. The special issue delivers on the stories of the lived experiences from researchers and community members as it relates to COVID-19 and COC. Twelve articles are illuminated to challenge the field to create social change.     

Comparing preference and resistance to change in constant- and variable-duration schedule components

Two experiments explored preference and resistance to change in concurrent chains in which the terminal links were variable-interval schedules that ended either after a single reinforcer had been delivered (variable duration) or after a fixed period of access to the schedule (constant duration). In Experiment 1, pigeons' preference between the same pair of terminal links overmatched relative reinforcement rate when the terminal links were of constant duration, but not when they were of variable duration. Responding during the richer terminal link decreased less, relative to baseline, when response-independent food was presented during the initial links according to a variable-time schedule. In Experiment 2, all subjects consistently preferred a terminal link that consisted of 20-s access to a variable-interval 20-s schedule over a terminal link that ended after one reinforcer had been delivered by the same schedule. Results of resistance-to-change tests corresponded to preference, as responding during the constant-duration terminal link decreased less, relative to baseline, when disrupted by both response-independent food during the initial links and prefeeding. Overall, these data extend the general covariation of preference and resistance to change seen in previous studies. However, they suggest that reinforcement numerosity, including variability in the number of reinforcers per terminal-link entry, may sometimes affect preference and resistance to change in ways that are difficult to explain in terms of current models.     

Using the Theory of Gender and Power to Examine Experiences of Partner Violence,Sexual Negotiation,and Risk of HIV/AIDS Among Economically Disadvantaged Women in Southern India

This article uses the Theory of Gender and Power to examine women's vulnerability to HIV/AIDS in order to: understand the vulnerability of female sex workers/poor women due to poverty and lack of educational resources; explore women's vulnerability in the context of client/partner violence, alcohol use, male partner's high-risk behaviors, and women's lack of control in their intimate relationships; and explore the role of traditional heterosexual gender norms in the outcomes of sexual negotiation. Ethnographic data were collected from 32 women and 38 men in India as part of an ongoing National Institute of Mental Health study. Results highlighted women's vulnerability to HIV/AIDS stemming from partner violence, alcohol use, poverty, dangers of sex work environments, and tacit acceptance of cultural/gender norms.     

Are Half of All IPV Perpetrators Women? Putting Context Back into the Intimate Partner Violence Research Field

For our field to truly understand women's use of IPV, it is crucial that the following three steps be taken by researchers to put context back into the equation: (a) incorporate the effects of multiple oppressions women face within the context of predominantly male offending across different types of violent criminal categories (top level); (b) integrate findings from both objective and subjective IPV research methods that will require elevating subjective approaches to the same status as objective (middle level); and (c) centralize the issue of ongoing patterns of coercion, power, and control within our definitions of IPV (individual level). Without such an embedded approach, our field will continue to divert much-needed resources toward the so-called gender symmetry debate and run the risk of helping to perpetuate further injustices against women.     

Resistance to peer influence during adolescence: Proposing a sociocultural-developmental framework

Assumptions regarding the vulnerability of adolescents to peer influences permeate the academic and popular literatures, especially as explanations of adolescent risk taking. In developmentally-oriented research that has addressed age differences in peer resistance/conformity, a psychosocially-based account has prevailed which attributes higher resistance scores of older compared with younger adolescents to the development of autonomy and individuation. In this paper, we propose an alternative sociocultural-developmental framework for the study of peer resistances. Contributing to the framework are, first, sociocultural perspectives on resistance within cultural and feminist studies that have implications for peer resistance scholarship in their alternative conceptualization of person–context relations and the consequent reorientation of the nature of the questions as well as the methods appropriate for addressing these questions. We then draw on dialogical theory to extend these perspectives to a more comprehensive framework encompassing developing-persons-in-changing-contexts and illustrate the framework with a research example.     

抗生素应用与细菌耐药性产生的辩证关系

临床上抗生素的不适当使用,造成了细菌耐药性问题日益严重,已成为目前医学上一个难题。从微生态平衡的角度,辩证地对抗生素使用和细菌耐药性产生的关系进行了分析,并提出了控制细菌耐药性产生的策略。为有效合理使用抗生素,预防和控制细菌耐药性产生提供了思路和方法。     

从耐药机制看抗菌药物的发展

抗菌药物耐药机制包括：（1）靶位修饰;（2）产灭活酶;（3）药物渗透力下降;（4）外排泵表达。本文从增加作用靶位、改善药物与靶位结合力、联合酶抑制药的复方药物、寻找体外泵抑制剂、发现新代合物和新靶位等方面介绍了临床使用的和临床前的新抗菌药物。     

Auditory and haptic systems for in-car speed management – A comparative real life study

Field experiments with ISA (intelligent speed adaptation) were carried out in Hungary and Spain in 2003 and 2004, respectively. Twenty private vehicles in each country were equipped with two kinds of systems: (1) support via an active accelerator pedal (AAP) and (2) warning via beep signals and a flashing red light when the speed limit was exceeded (BEEP). The test drivers drove for a month with both systems installed in each car. Speed was continually logged in all the vehicles and the test drivers were interviewed about their acceptance and experiences of the systems. The results show that both systems reduced the mean and 85 percentile speeds, but that the AAP was more effective. There was no long-lasting effect on speeds when the systems were removed. After the trial half of the drivers were willing to keep an ISA system, but more drivers wanted to keep the BEEP-system even though it showed lower satisfaction ratings than the AAP. The results indicate no major differences between the countries despite the workload being perceived to be higher in Hungary than in Spain.